A nearest transmitter classification method for VLC based positioning system

Nearest transmitter information is a mandatory requirement for utilizing Switching Estimated Receiver Position (SwERP) scheme, of which was proposed to enhance accuracy of Visible Light ID (VLID) positioning system. The conventional approach is achieved by controlling Sensitivity (RxS) limit. Conversely, general distance estimation by optical received power can also be used. Both of the mentioned methods have disadvantage on implementation complexity and inaccuracy due to noise fluctuation, respectively. In this paper, we propose a nearest transmitter classification (NTC) method by utilizing Optical Orthogonal Code (OOC) with On-Off Keying (OOK) modulation at transmitters (Txs), and perform oversampling at a receiver (Rx) to overcome the limitation of bandwidth resolution (B). The results confirm that the proposed method can classify the nearest Tx accurately, with some tradeoff with computation complexity from the increment of oversampling factor (Oc).